Some of the big salmon flasher and dodger type companies have been marketing a 6″ flasher that could be used for walleye fishing. They might work, but to be honest I have never used one before. That said, I have been using flashers/attractors in one form or another for a long time in fishing for walleye.
My first attempt was a “double” harness of sorts. I would take a 9 foot length of line and and tie a single hook snell at the end. Add my beads and blades and then take the line and snell two more hooks roughly four foot from there. Again, I added my beads and blade and then double looped my line at the end. It worked pretty good, almost too well in fact. A cardinal rule is to check your line on the harnesses after every fish, I would get a lot of hits on the two hook section, and it rarely nicked the line, but when a double hit would happen, then I would get the nicks. Would have to scrap that harness and break out another one.
My second “homemade” flasher is a bit more conventional and I won’t call it copied, but there are a lot of folks using these. Sometimes you come up with an idea, and somewhere a hundred miles away someone else who contemplates walleye fishing as much as you do from every angle comes up with the same ideas. This happened with the spoon concept, and to be honest I don’t know who came up with it first, but it does work. You connect your spoon to a 4 or 5 foot lead, with the treble hook removed, take a 3 or 4 foot harness and attach to the rear of the spoon. I do think one difference between the different methods of doing this is in that I use a 3 and 4 inch spoon, while the others I have seen use the 2+ inch model walleye spoons. A strong belief that I have when it comes to walleye fishing is to the use the biggest items I can get a way with. It also applies to line and lures.
The last type of flasher that I have been using for about the past five years has been these things from Mack’s Lures called “Hot Wings”. I didn’t come up with this on my own, and give full credit to a husband and wife walleye fishing team that I met while working seminars. Bill and Bernadine Ayers are truly the nicest two people you could hope to meet and are on Mack’s Lures Pro Staff. Here is a pic of the couple, and again, the best thing I can say about them, they are good people.

The unique thing about the “Hot Wings” themselves, is that there are two sets of wings. They actually spin in separate directions creating quite a stir in the water.

Rig them the same way as what I did with the spoons, and you will catch fish, good luck.